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from struct import pack
from .protobj import Protobj

def build_list(conn, stream, list_, type):
    """
        writes a *list_* of objects of the elementar
        data type *type* (where *type* is a :mod:`struct`-compatible
        type char) to *stream*.

        For each item, this checks if the item is a
        :class:`ooxcb.protobj.Protobj`. If it is, the object's `build` method
        is called.
    """
    for item in list_:
        if getattr(type, 'create_lazy', None):
            item = type.create_lazy(conn, item)
        if isinstance(item, Protobj):
            item.build(stream)
        else:
            stream.write(pack(type, item))
